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Peru
Corihuarmi Mine

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 Location:
69 km SW from Huancayo, Peru

  Regional Office:
Av. Santa Cruz Nº 830, Of. 401 Miraflores
Lima
Peru
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Fax446-1848
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2020
Latest NewsMinera IRL Files New Pre-Feasibility Study for its Corihuarmi Mine on SEDAR     July 6, 2018


Owners & OPERATOR

Source: p. 4, 20
CompanyInterestOwnership
Minera IRL Ltd. 100 % Indirect
Minera IRL S.A. (operator) 100 % Direct
Minera IRL Ltd. operates the Corihuarmi Gold Mine through its subsidiary Minera IRL SA.

Deposit Type

  • Epithermal


Summary:

The Susan and Diana Au oxide mineralization of Corihuarmi are associated with epithermal deposit types. Epithermal gold deposits form in hydrothermal systems related to volcanic activity. These systems, while active, discharge to the surface as hot springs or fumaroles.

Epithermal gold deposits occur largely in volcano-plutonic arcs (island arcs as well as continental arcs) associated with subduction zones, with ages similar to those of volcanism. The deposits form at shallow depth, <1km, and are hosted mainly by volcanic rocks.

There are two end-member styles of epithermal gold deposits, high sulfidation (HS) and low sulfidation (LS). The two deposit styles form from fluids of distinctly different chemical composition in contrasting volcanic environment. The Diana and Susan deposits are of the HS style.

Mineralization identified to date within the Corihuarmi Project comprises a high sulphidation epithermal precious metal system that formed at relatively shallow depth. Gold and silver mineralization is essentially confined to remnant zones of silicification and brecciation that dominantly lie along the northeast margin of the volcanic complex. Horizontal metallogenic zonation provides evidence that this siliceous layer was once continuous, effectively capping the hydrothermal system.

The most significant mineralization is associated with the Susan and Diana zones, which comprise resistant remnant mineralized silicified bluffs separated by some 180m. The Susan deposit measures approximately 200m by 350m in size, being confined at the margins by cliffs. The smaller Diana Zone is approximately 150m by 250m in area, and to some extent remains open to the northwest and southeast along the ridge-line. The siliceous layer is shallow dipping to sub-horizontally disposed, ranging in thickness from 10m to 75m, and averaging approximately 45m.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Gold mineralisation is mined by open pit methods at a mine production rate of 9,000 tonnes per day (t/d) of ore and 5,000 t/d of waste. The average grade produced in 2017 year was around 0.27 g/t and it is expected 0.28 g/t will be produced in the following years (2018 to 2020).

Mining at Corihuarmi uses a conventional truck and excavator configuration. Open pits are mined on 5-meter-high benches through drilling, blasting, loading and hauling unit operations. The material transportation circuit is performed in two parts; the first one is from the pit to the crusher and the second one from the crusher to the leach pad. If the ore does not require additional crushing, the material is transported directly to the leach pad. The waste is transported to the waste dump.

The mine schedule was produced in monthly periods and is based on 7 small pits which will be mined throughout 3 years of mining operations.


Crushing and Grinding


Processing

  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Project is a heap leach operation utilizing a multiple-lift, single-use leach pad. Prior to placing the ore onto the leach pad the ore is primary crushed. Processing of ore began in January 2008 when irrigation of the heaps was started.

Ore from the mine, with a moisture content of 4 to 5% is transported by trucks to the Run of Mine (ROM) pad. The ore is then either dumped directly into the coarse ore bin (COB) or can be placed on the ROM pad and fed into the COB by front end loader.

Ore is withdrawn from the COB by a vibrating scalping grizzly feeder with 100mm gap size. The plus 100mm is fed into the primary jaw crusher. The minus 100 mm grizzly undersize material and the crusher product both drop onto the jaw crusher discharge conveyor. As the ore travels along the conveyor it is weighted and lime is added. From this conveyor the ore is discharged onto a stacking conveyor and is stockpiled. The crushed material is reclaimed using a front end loader and tr ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Head Grade, g/t 0.250.240.320.320.330.32

Production:

CommodityUnits202020192018201720162015
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required24,70923,39923,917
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required3,040,331 t2,965,576 t2,660,039 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required1,430,311 t825,985 t291,609 t
Daily mining capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily ore mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required8,300 t7,300 t
Subscription required - Subscription is required.

Reserves at May 2, 2018:

CategoryTonnage CommodityGradeContained Metal
Proven 7,966,900 t Gold 0.28 g/t 70,900 oz
Probable 775,800 t Gold 0.27 g/t 6,900 oz
Proven & Probable 8,742,800 t Gold 0.28 g/t 77,700 oz
Measured 11,800,000 t Gold 0.27 g/t 104,000 oz
Indicated 1,760,000 t Gold 0.27 g/t 15,000 oz
Measured & Indicated 13,560,000 t Gold 0.27 g/t 119,000 oz
Inferred 420,000 t Gold 0.3 g/t 4,000 oz

Commodity Production Costs:

CommodityUnits201920182017201620152014
Cash costs Gold USD 658 / oz 705 / oz
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required 849 / oz 806 / oz 793 / oz
Total cash costs (sold) Gold USD 789 / oz 874 / oz
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required 1,106 / oz 1,074 / oz 1,047 / oz
Subscription required - Subscription is required.

Financials:

Units2020201920182017201620152014
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 3.13   2.31  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 27.6   29.9  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 8.61   9.18  
Subscription required - Subscription is required


Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Compactor ....................... Subscription required 1 Aug 16, 2019
Dozer (crawler) ....................... Subscription required 1 May 2, 2018
Dozer (crawler) ....................... Subscription required 1 May 2, 2018
Dozer (crawler) ....................... Subscription required 1 May 2, 2018
Drill ....................... Subscription required 4 inch 3 May 2, 2018
Excavator ....................... Subscription required 2.4 cu. m 3 May 2, 2018
Excavator ....................... Subscription required 1 May 2, 2018
Grader ....................... Subscription required 1 May 2, 2018
Loader (FEL) ....................... Subscription required 4.5 cu. m 3 May 2, 2018
Truck (dump) ....................... Subscription required 40 t 10 Aug 16, 2019
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 29, 2020
....................... Subscription required ....................... Subscription required Subscription required May 29, 2020
....................... Subscription required ....................... Subscription required Subscription required May 29, 2020
....................... Subscription required ....................... Subscription required Subscription required May 29, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Information Form 2017
Annual Report 2017
Management Discussion & Analysis 2017
Technical Report 2017
Annual Information Form 2016
Annual Report 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Annual Report 2015
Management Discussion & Analysis 2015
Technical Report 2010
Subscription required - Subscription is required.

News:

NewsDate
Minera IRL Files New Pre-Feasibility Study for its Corihuarmi Mine on SEDAR July 6, 2018

Aerial view:

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